Commission Implementing Decision of 12 December 2011 laying down rules for Directives 2004/107/EC and 2008/50/EC of the European Parliament and of the Council as regards the reciprocal exchange of information and reporting on ambient air quality (notified under document C(2011) 9068) (2011/850/EU)

(A) Data requirements U.K.

(1) Reporting of time U.K.

All time references shall be made available in accordance with the ISO standard 8601:2004(E) using the extended format (YYYY-MM-DDThh:mm:ss ± hh:mm) that includes the information on difference from UTC.

The time stamp refers to the end of the measurement period.

(2) Number of digits and rounding U.K.

Data should be made available with the same number of digits as they are used in the monitoring network.

Rounding has to be the very last step of any calculation, i.e. immediately before comparing the result with the environmental objective and has to be done only once. By default the system will perform rounding of the data made available where appropriate following the commercial rounding rules.

(3) Equivalence U.K.

When more than one assessment method is used at a specific location, data should be supplied using the assessment method exhibiting the lowest uncertainty at that specific location.

(4) Standardisation U.K.

The provisions set out in Part IV of Annex IV to Directive 2004/107/EC and Part C of Annex VI to Directive 2008/50/EC should apply to the reciprocal exchange of information.

(5) Provisions for PM_2,5 U.K.

Limit values plus margin of tolerance U.K.

For PM_2,5, in accordance with Part E of Annex XIV to Directive 2008/50/EC, the following sum of limit value (LV) + margin of tolerance (MOT) shall apply in the respective years mentioned below:

Year	LV + MOT
2008	30
2009	29
2010	29
2011	28
2012	27
2013	26
2014	26
2015	25

Calculation of the Average Exposure Indicator (AEI) in accordance with Part A of Annex XIV to Directive 2008/50/EC U.K.

Calculation is made for each individual year, calculating PM_2,5 annual means for each of the selected sampling points. The selection of the sampling points has to be evident from the appropriate information made available.

Valid annual means complying with the data quality objectives are averaged over all designated AEI sites of the [F1 appropriate authorities and the appropriate authorities in Wales, Scotland and Northern Ireland and the competent authority in England must cooperate with the Secretary of State to ensure the Secretary of State is able] to obtain an annual average.

Textual Amendments

F1 Words in Annex 1 para (A)(5) substituted (31.12.2020) by The Air Quality (Miscellaneous Amendment and Revocation of Retained Direct EU Legislation) (EU Exit) Regulations 2018 (S.I. 2018/1407), regs. 1, 4(19)(a); 2020 c. 1, Sch. 5 para. 1(1)

The procedure is repeated for each of the 3 years, and the three annual averages are then averaged to obtain the AEI.

The AEI shall be made available annually as a three-year running mean. In case of a need to update any of the data that could directly or indirectly (through selection of sampling point) influence the AEI, the complete update of all affected information is necessary.